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Article: Neoproterozoic crustal growth and reworking of the Northwestern Yangtze Block: Constraints from the Xixiang dioritic intrusion, South China

TitleNeoproterozoic crustal growth and reworking of the Northwestern Yangtze Block: Constraints from the Xixiang dioritic intrusion, South China
Authors
KeywordsDioritic intrusion
Neoproterozoic
Petrogenesis
Yangtze Block
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2010, v. 120 n. 3-4, p. 439-452 How to Cite?
AbstractNeoproterozoic magmatism along the northwestern margin of the Yangtze Block, South China, produced voluminous adakitic and normal arc felsic intrusions associated with many mafic-ultramafic bodies. Dioritic plutons are rare but are important for understanding the crustal growth and secular evolution of the region. The Xixiang dioritic intrusion at Hannan, on the northwestern margin of the Yangtze Block, provides a good opportunity to investigate the petrogenesis of intermediate plutons and to document the Neoproterozoic continental crustal evolution of the region. The pluton has a zircon U-Pb age of 764±9 Ma. Rocks from the pluton have relatively low SiO 2 (59.3-63.0wt.%) and K 2O+Na 2O (5.8-6.2wt.%) and high MgO (2.3-3.1wt.%) and Al 2O 3 (15.8-17.1wt.%). They have chondrite-normalized REE patterns enriched in LREE (La/Ybn=7.2-14.7) with negative Eu anomalies. Their primitive mantle-normalized trace element patterns are characterized by enrichment of LILE and depletion of HFSE (Nb and Ta) with positive Pb and negative Ti anomalies. They have a narrow range of initial 87Sr/ 86Sr ratios (0.7033 to 0.7035) with positive εNd values (+1.94 to +3.16). Their zircon εHf values range from +5.5 to +9.8 with an average of +7.32. These isotopic data are similar to those of the Neoproterozoic mafic-ultramafic intrusions in the Hannan region, suggesting that the diorites were generated by partial melting of newly emplaced basaltic rocks. The diorites have Mg# values (50.3-54.4) higher than those of experimental melts of mafic igneous rocks. In addition, they contain Fe-rich clinopyroxene, suggesting that partial melts of the newly formed mafic lower crust interacted with the mafic residue. Based on its arc-related geochemical affinity and emplacement preceding voluminous adakitic magmatism, the Xixiang intrusion is proposed to have been generated in a Neoproterozoic arc setting during crustal growth and reworking that lasted from >950Ma to <730Ma, a period of more than 200m.y. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139221
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
National Nature Science Foundation of China40873027
90714002
Central Colleges China University of Geosciences (Wuhan)
University of Hong Kong
Special Fund for Basic Scientific Research of Central Colleges
Funding Information:

This work was substantially supported by the National Nature Science Foundation of China (40873027 90714002) the Special Fund for Basic Scientific Research of Central Colleges China University of Geosciences (Wuhan) and a 973 project matching grant from the University of Hong Kong We are grateful to Xiao Fu and Gao Jianfeng for geochemical analyses Reviews by Nelson Eby Paul T Robinson and an anonymous referee improved an early draft of this paper and are gratefully acknowledged

References

 

DC FieldValueLanguage
dc.contributor.authorZhao, JHen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorZheng, JPen_HK
dc.contributor.authorFang, SMen_HK
dc.date.accessioned2011-09-23T05:47:14Z-
dc.date.available2011-09-23T05:47:14Z-
dc.date.issued2010en_HK
dc.identifier.citationLithos, 2010, v. 120 n. 3-4, p. 439-452en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139221-
dc.description.abstractNeoproterozoic magmatism along the northwestern margin of the Yangtze Block, South China, produced voluminous adakitic and normal arc felsic intrusions associated with many mafic-ultramafic bodies. Dioritic plutons are rare but are important for understanding the crustal growth and secular evolution of the region. The Xixiang dioritic intrusion at Hannan, on the northwestern margin of the Yangtze Block, provides a good opportunity to investigate the petrogenesis of intermediate plutons and to document the Neoproterozoic continental crustal evolution of the region. The pluton has a zircon U-Pb age of 764±9 Ma. Rocks from the pluton have relatively low SiO 2 (59.3-63.0wt.%) and K 2O+Na 2O (5.8-6.2wt.%) and high MgO (2.3-3.1wt.%) and Al 2O 3 (15.8-17.1wt.%). They have chondrite-normalized REE patterns enriched in LREE (La/Ybn=7.2-14.7) with negative Eu anomalies. Their primitive mantle-normalized trace element patterns are characterized by enrichment of LILE and depletion of HFSE (Nb and Ta) with positive Pb and negative Ti anomalies. They have a narrow range of initial 87Sr/ 86Sr ratios (0.7033 to 0.7035) with positive εNd values (+1.94 to +3.16). Their zircon εHf values range from +5.5 to +9.8 with an average of +7.32. These isotopic data are similar to those of the Neoproterozoic mafic-ultramafic intrusions in the Hannan region, suggesting that the diorites were generated by partial melting of newly emplaced basaltic rocks. The diorites have Mg# values (50.3-54.4) higher than those of experimental melts of mafic igneous rocks. In addition, they contain Fe-rich clinopyroxene, suggesting that partial melts of the newly formed mafic lower crust interacted with the mafic residue. Based on its arc-related geochemical affinity and emplacement preceding voluminous adakitic magmatism, the Xixiang intrusion is proposed to have been generated in a Neoproterozoic arc setting during crustal growth and reworking that lasted from >950Ma to <730Ma, a period of more than 200m.y. © 2010 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.subjectDioritic intrusionen_HK
dc.subjectNeoproterozoicen_HK
dc.subjectPetrogenesisen_HK
dc.subjectYangtze Blocken_HK
dc.titleNeoproterozoic crustal growth and reworking of the Northwestern Yangtze Block: Constraints from the Xixiang dioritic intrusion, South Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=120&issue=3-4&spage=439&epage=452&date=2010&atitle=Neoproterozoic+crustal+growth+and+reworking+of+the+Northwestern+Yangtze+Block:+Constraints+from+the+Xixiang+dioritic+intrusion,+South+China-
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2010.09.005en_HK
dc.identifier.scopuseid_2-s2.0-78649443023en_HK
dc.identifier.hkuros195328en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78649443023&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume120en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage439en_HK
dc.identifier.epage452en_HK
dc.identifier.isiWOS:000285706600013-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhao, JH=49061691300en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridZheng, JP=24342619200en_HK
dc.identifier.scopusauthoridFang, SM=23992265000en_HK
dc.identifier.citeulike7877759-

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